import java.util.Scanner;
public class Example2_3 {
    public static void main(String args [ ]) {
       System.out.println("请输入若干个数，每输入一个数回车确认");
       System.out.println("最后输入数字0结束输入操作");
       Scanner reader = new Scanner(System.in);
       double sum = 0;
       double x = reader.nextDouble();
       while(x!=0) {
          sum = sum +x;
          x = reader.nextDouble();
       }
       System.out.println("sum="+sum);
    }
}
